Visible Light-Driven α-Fe2O3 Nanorod/Graphene/BiV1-xMoxO4 Core/Shell Heterojunction Array for Efficient Photoelectrochemical Water Splitting
Visible Light-Driven α-Fe2O3 Nanorod/Graphene/BiV1-xMoxO4 Core/Shell Heterojunction Array for Efficient Photoelectrochemical Water Splitting
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DOI：
10.1021/nl303961c
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发表时间：
2012-12-01
期刊：
影响因子：
10.8
通讯作者：
Feng, Pingyun
中科院分区：
文献类型：
--
作者：
Hou, Yang;Zuo, Fan;Feng, Pingyun
我们报道了一种用于光电化学水分解的新型α - fe2o3 /石墨烯/BiV1-xMoxO4核/壳纳米棒异质结阵列的设计、合成和表征。采用水热沉积法在Ti衬底上制备α - fe2o3纳米棒异质结阵列，随后分别采用光催化还原法和自旋镀膜法在石墨烯间层和BiV1-xMoxO4壳层上进行涂层。该异质结在1.0 V vs Ag/AgCl下的光电流密度可达1.97 mA/cm(2)，在-0.04 V vs Ag/AgCl下的光电转换效率可达0.53%。改善的光电化学性能得益于(1)α - fe2o3核心与BiV1-xMoxO4壳层之间的“窗口效应”增强了光吸收，以及(2)α - fe2o3纳米棒/石墨烯/ BiV1-xMoxO4界面上光生载流子的分离改善。我们的研究结果证明了新型石墨烯介导的核/壳异质结阵列的优势，并为此类材料的进一步开发提供了有价值的见解。
We report the design, synthesis, and characterization of a novel heterojunction array of alpha-Fe2O3/graphene/BiV1-xMoxO4 core/shell nanorod for photoelectrochemical water splitting. The heterojunction array was prepared by hydrothermal deposition of alpha-Fe2O3 nanorods onto Ti substrate, with subsequent coating of graphene interlayer and BiV1-xMoxO4 shell by photocatalytic reduction and a spin-coating approach, respectively. The heterojunction yielded a pronounced photocurrent density of similar to 1.97 mA/cm(2) at 1.0 V vs Ag/AgCl and a high photoconversion efficiency of similar to 0.53% at -0.04 V vs Ag/AgCl under the irradiation of a Xe lamp. The improved photoelectrochemical properties benefited from (1) the enhanced light absorption due to behavior of the "window effect" between the alpha-Fe2O3 cores and BiV1-xMoxO4 shells, and (2) the improved separation of photogenerated carriers at the alpha-Fe2O3 nanorod/graphene/BiV1-xMoO4 interfaces. Our results demonstrate the advantages of the novel graphene-mediated core/shell heterojunction array and provide a valuable insight for the further development of such materials.